I'm having problems getting the gear out of the needle. I try for the injection but the liquid will not come out, and this is with me not putting too much force behind it, but I know I shouldn't have to. I'm using the correct size needles and I'm checking before I inject and it's coming out before hand. After it's in I gentley pull back and everything is fine so then I try to push and it will not go... I take it out and and still very hard to push, it looks like tissue has clogged the needle. Never had this problem and already tried two different types of needles??? Any advice???